His horrified mother Jodie Collins, who had been using an exercise machine in the garage while her sons played, discovered the fire and pulled the little boy out of the bedroom.

Nathan was rushed to nearby Airedale Hospital, but despite the best efforts of medics he died from the effects of inhalation.

The court heard his brother Matthew, aged 10, had taken the utility lighter from the top shelf of the pantry at the family's home and placed it under his bed to look at later because he thought it looked like a gun and he wanted to shoot it out of the window.

"After finishing her exercise Ms Collins had gone upstairs to shower when she noticed Matthew's bedroom door had blackened around the top."